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Shareholders' Equity Reconciliation of Weighted Average Number of Shares (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity [Abstract]        
Weighted average number of common shares outstanding 64,130 66,000 64,444 66,068
Director Plan and deferred stock units 166 242 181 224
ESOP 110 82 101 84
Common shares outstanding—basic 64,406 66,324 64,726 66,376
Dilutive effect of Option Plans and Omnibus Plan 891 1,505 913 1,611
Common and potential common shares outstanding—diluted 65,297 67,829 65,639 67,987